Very slowly. Stopping is not as a big of an issue as cornering though - not only they don't have adequate traction for the speed and mass but they also don't use the front brake. Which is great as the trails which are fun to ride because of all the bends are also e-bike free other than old people riding their pedal-assist bikes at 15 mph.

My e-scooter reaches 45 mph (advertised as 53). Normally, you would stop using the brakes or regen.

What thin bicycle tires - they are much thicker than normal.

However yes they are a problem.